Javelin



Oct. 15, 1929. E, RlNNEBE- RG 1,731,686

JAVELIN 'l Filed oct. 11. 1927 Patented Ust. 15, 1929 nniran sra'rlss EMIL RINNEBERG, OF rNUREJNIBERG, GERMANY JAVELIN Application filed October 11, 1927, Serial N0. 225,438, and in Germany May 12, 1927.

rlhe present invention has reference to javelins and relates more particularly to a new javelin structure the main components of which have approximately the same modulus of elasticity.

It is well known in this art that a avelin, when thrown, is apt to vibrate about its norw mal axis, and attempts have been heretofore made to overcome this drawback which seriously interferes with the proper flight of the spear, as well as to improve the rigidity of the javelin against fractures and breakage, by axially boring out the wooden javelin shaft and providing it with a light metal lining or core. rifhe use of, such a metal insertion, while reducing the natural vibrations of the javelin in flight 'to an appreciable de grec, is, however, objectionable, because it considerably increases the danger of fracture, due to the fact that the metal core and the wooden mantle shaft have different degrees of elasticity, and such a combination of materials is difficult to produce without unfav0r= ably affecting the balance of the javelin.

rlhe present invention eectively obviates this disadvantage by using for the core of the javelin a material the elasticity of which is substantially the same as that of the mantle material.

My invention will readily be understood from the accompanying. drawing which shows a javelin of my improved manufacture in longitudinal section, with the middle portions broken out to save space.

rihe javelin comprises the mantle tube orl shaft a of a suitable wood, into whose interior is closely fitted the core of a material the elasticity coefficient of which is the same as, or at least closely approximates that of, the mantle material.

The front shaftend may conventionally be provided with a metal tip 0. lf have found that the so-called Spanish reed (fi/rando (imam), rattan or' cane, is an eminently suitable material for this purpose. For use the reed rod is decorticated and is then suitably cemented in place in the wooden mantle shaft. Such reed material is light of A weight, is highly flexible, is cheap .and can readily be shaped to fit the mantle bore, and, 

